Precision detection device for force standard machine, force value comparison machine and precision detection method for force standard machine

Abstract

A precision detection device for a force standard machine includes a first hydraulic cylinder, a pipeline and a force loading device. A liquid medium is disposed in, the first hydraulic cylinder, and a liquid level area of the liquid medium is a known Value. The pipeline is a hollow tubular structure, and a first end of the pipeline is communicated with the liquid medium in the first hydraulic cylinder. The force loading device acts on the liquid medium, in the first hydraulic cylinder to produce a pressure increment or a pressure intensity increment on the, liquid medium. A force value comparison machine and a precision detection method for a force standard machine are also provided.

I claim: 
     
       1. A force value comparison machine, comprising a precision detection device ( 1 ), a to-be-detected force standard machine ( 12 ), and a pipeline ( 6 ), wherein
 the precision detection device ( 1 ) comprises:
 a first hydraulic cylinder ( 2 ) and a first piston ( 10 ), wherein a first liquid medium is disposed in the first hydraulic cylinder ( 2 ), and an end surface of the first piston ( 10 ) contacts with the first liquid medium in the first hydraulic cylinder ( 2 ); 
 
 the to-be-detected force standard machine ( 12 ) comprises:
 a second hydraulic cylinder ( 14 ), a second piston ( 16 ), and a second measurement device ( 18 ), wherein a second liquid medium is disposed in the second hydraulic cylinder ( 14 ), wherein a first end of the pipeline ( 6 ) is communicated with the first liquid medium in the first hydraulic cylinder ( 2 ), and a second end of the pipeline ( 6 ) is communicated with the second liquid medium in the second hydraulic cylinder ( 14 ); 
 
 wherein an end surface of the second piston ( 16 ) contacts with the second liquid medium in the second hydraulic cylinder ( 14 ); and 
 
       when the first piston ( 10 ) is configured to receive a first acting force F 1  which enables the second piston ( 16 ) to correspondingly receive a second acting force F 2 , the second measurement device ( 18 ) is configured to measure a value of the second acting force F 2  loaded on the second piston ( 16 );
 the first piston ( 10 ) is configured to continue receiving a third acting force Fn until the value of the second acting force F 2  starts to fluctuate; 
 a precision of the second measurement device ( 18 ) is configured to be calculated based on area ratio of the first and second piston ( 10 ), ( 16 ), the value of the second acting force F 2 , and the value of the third acting force Fn. 
 
     
     
       2. The force value comparison machine according to  claim 1 , wherein the area of the end surface of the first piston ( 10 ) is S 1 , the area of the end surface of the second piston ( 16 ) is S 2 , the precision of the second measurement device ( 18 ) equals to 
       
         
           
             
               
                 
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       3. The force value comparison machine according to  claim 1 , wherein the force value comparison machine comprises a first measurement device ( 8 ), the first measurement device ( 8 ) is configured to measure a value of the first acting force F 1  loaded on the first piston ( 10 ). 
     
     
       4. The force value comparison machine according to  claim 3 , when a precision of the first measurement device is predefined and the area ratio of the first and second piston ( 10 ), ( 16 ) are undefined, the area ratio of the first and second piston ( 10 ), ( 16 ) equals to the precision of the first measurement device. 
     
     
       5. The force value comparison machine according to  claim 1 , wherein the first piston ( 10 ) slides in the first hydraulic cylinder ( 2 ), and a closed space is formed between a side surface of the first piston ( 10 ) and an inner wall of the first hydraulic cylinder ( 2 ). 
     
     
       6. The force value comparison machine according to  claim 1 , where the first acting force F 1  is loaded on the first piston ( 10 ) to produce a pressure increment or a pressure intensity increment in a direction of compressing the first liquid medium in the first hydraulic cylinder ( 2 ) or in a direction opposite to the direction of compressing. 
     
     
       7. The force value comparison machine according to  claim 1 , wherein the pipeline ( 6 ) is a hollow tubular structure. 
     
     
       8. A method for measuring a precision of a to-be-detected force standard machine ( 12 ), comprising:
 applying a first acting force Fl on a first piston ( 10 ) of a precision detection device ( 1 ); 
 measuring a second acting force F 2  loaded on a second piston ( 16 ) of the to-be-detected force standard machine ( 12 ) accordingly; 
 continuing adding a third acting force Fn until the value of the second acting force F 2  starts to fluctuate; and 
 calculating a precision of the second measuring device based on area ration of the first and second piston ( 10 ), ( 16 ), the value of the second acting force F 2 , and the value of the third acting force Fn. 
 
     
     
       9. The method of  claim 8 , wherein an area of an end surface of the first piston ( 10 ) is S 1 , an area of an end surface of the second piston ( 16 ) is S 2 , the precision of the second measurement device ( 18 ) equals to 
       
         
           
             
               
                 
                   Fn 
                   * 
                   
                     
                       S 
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                       ⁢ 
                       2 
                     
                     
                       S 
                       ⁢ 
                       
                           
                       
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                       1 
                     
                   
                 
                 
                   F 
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                   2 
                 
               
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                 % 
                 . 
               
             
           
         
       
     
     
       10. The method of  claim 8 , further comprising:
 measuring a value of the first acting force Fl loaded on the first piston ( 10 ).